Past Perfect form
John _________________ (return) home before the storm broke out.
John had returned home before the storm broke out.
The children ___________________ (do) their homework by 8.30.
The children had done their homework by 8.30.
She ______________ (have) a very busy week before she finally went on holiday.
She had had a very busy week before she finally went on holiday.
He ____________ (not/have) a shower before he went to work.
He hadn't had a shower before he went to work.
______________ (you/not/have) dinner before you left home?
Hadn't you had dinner before you left home?